Disposable hypodermic syringe has lockable safety sleeve in which needle holder is retracted after use

摘要

Disposable hypodermic syringe has a safety sleeve (7) with a forward end (8) in which a barrel can slide between an operating position with a needle holder deployed and a safety position with it retracted. The syringe has a telescopic head (9) containing a spring (11) which is released automatically at the end of the pressure stroke to retract the barrel and needle inside the sleeve. Disposable hypodermic syringe comprises a barrel (1), a needle holder (4), a plunger (5) and a safety sleeve (7) with a forward end (8) in which the barrel can slide between an operating position with the needle holder deployed and a safety position with it is retracted. The syringe has a telescopic head (9) containing a spring (11) which is released automatically at the end of the pressure stroke to retract the barrel and needle inside the sleeve. Lugs (27) inside the head hold the barrel in its retracted position and prevent re-use.